[support] hide menu items without nodes

I'm planning a site with two navigations:

first navigation: - term1 of vocabulary1 - term1 of vocabulary2 - term2 of vocabulary2 - term2 of vocabulary1 - term1 of vocabulary2 - term2 of vocabulary2

second navigation: - vocabulary2 - term1 of vocabulary2 - term2 of vocabulary2

The parent terms of the navigation will simply point to the taxonomy term (taxonomy/term/id), the child terms to the corresponding view (if there's a better solution, how to achieve such a navigation structure, please let me know).

Is there a module or any code snippet to hide navigation items if the corresponing taxonomy term or view doesn't have any nodes assigned? I searched but couldn't find any.

Thanks. Richard